(19)
(11) EP 0 364 951 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
16.01.1991 Bulletin 1991/03

(43) Date of publication A2:
25.04.1990 Bulletin 1990/17

(21) Application number: 89119256.9

(22) Date of filing: 17.10.1989
(51) International Patent Classification (IPC)5: G02B 17/06, G02B 17/00
(84) Designated Contracting States:
DE FR GB IT NL

(30) Priority: 17.10.1988 US 259013
17.10.1988 US 259012

(71) Applicant: Hughes Aircraft Company
Los Angeles, California 90045-0066 (US)

(72) Inventor:
  • Cook, Lacy G
    El Segundo California 90245 (US)

(74) Representative: KUHNEN, WACKER & PARTNER 
Alois-Steinecker-Strasse 22
85354 Freising
85354 Freising (DE)


(56) References cited: : 
   
       


    (54) Continuous zoom all-reflective optical system


    (57) The present optical system provides an all-reflective continuous zoom optical system. An imaging mechanism including the tertiary mirror (14) of a three-mirror (10, 12, 14) anastigmat is moved to effect a change in the focal length, field of view, or both of the system.







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